Postfix Virtual domain mapping working suddenly

[Michael Leung]

Here is postconf -n:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = localhost
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.1.5/README_FILES
sample_directory = /usr/share/doc/postfix-2.1.5/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
unknown_local_recipient_reject_code = 550
virtual_alias_maps = hash:/etc/postfix/virtual

maillog:

Feb 18 14:27:12 server01 sendmail[10732]: j1I4RCiM010732:
from=spamcontrol at localhost, size=662, class=0, nrcpts=1,
msgid=<53425.220.244.224.9.1108700832.squirrel at www.nationalforum.com.au>,
relay=apache at localhost
Feb 18 14:27:12 server01 sendmail[10733]: j1I4RCLB010733:
<spam1 at whatthepeoplewant.net>... User unknown
Feb 18 14:27:12 server01 sendmail[10732]: j1I4RCiM010732:
to=spam1 at whatthepeoplewant.net, ctladdr=spamcontrol at localhost
(505/505), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30662,
relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User unknown

Some strange